School violence is an ongoing problem. It has a great influence on the physical and mental health development of teenagers. The purpose of this review is to summarize the current situation of school violence and strategies to reduce its occurrence. By reviewing the relevant literature, the results show that the causes of school violence are both external environmental factors and internal personal factors. Bystanders can influence school violence and play an important role in school violence. The reduction of school violence requires a three-pronged effort from families, teachers, and schools. This review highlights the negative effects of school violence on adolescents, and future research should enrich the ways to avoid the occurrence of school violence.